Originally published in Nature 142, III (1938) 



33. FORMATION OF MILK 



A. H. W. Aten and G. Hevesy 

 From the Institute of Theoretical Physics, University of Copenhagen 



We have administered labelled (radioactive) sodium phosphate to goats 

 and investigated to what extent phosphorus present in different com- 

 pounds extracted from the blood and the milk became labelled. In two 

 cases the goat was killed after the experiment and the phosphorus 

 compounds present in the organs investigated as well. Some of the 

 results obtained are seen in the accompanying table. 



Inorganic phosphorus 



The inorganic phosphorus extracted from the milk produced in the 

 first two hours after the subcutaneous injection of the labelled phos- 

 phorus, shows considerable radioactivity. Should the milk contain 



